Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
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AC Issues in two story home
hoping to get some direction on this situation. I live in Arizona, super hot here obviously, and I have an issue that is very opposite to most of the AC issues people online seem to complain about.
So ...
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What is causing the leak inside my furnace?
What could be causing the leak in this area? I assume it's a slow leak since I never noticed it until i opened the panel. Both the A/C and heating are working.
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Central a/c unit leaking water through ceiling
The central a/c unit in the condo I rent is leaking water through the ceiling. The thermostat works fine, the air filter is new, and the a/c successfully cools the unit when it runs. Technician came ...
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Modifying the thermostat of a regular AC to create a refrigeration room? [closed]
Not sure this is a "home improvement" question, I want to build a refrigeration room and instead of buying some industrial cooling aggregate through complicated distributor sales channels I ...
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Is this HVAC reducing plenum system designed correctly?
I am redoing my duct work for my home. I have a 3 ton, 1200 CFM central air system. It is currently a undersized "octopus" system. This is what I've landed on for a reducing plenum design. ...
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Replacing old Honeywell line voltage thermostat
My son's 1968 condominium has an old Honeywell T651A 2028 line voltage t-stat which controls the wall unit providing both heating and cooling. We are trying to update the t-stat with something a ...
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AC circuit board still blinking after disconnect - safe to remove capacitor?
My HVAC unit stopped running, and the tech said it was a blown transformer. I replaced the transformer and the blower unit started working. However, the AC unit will not start. I have tried ...
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Hvac crawlspace vent preventing AC from reaching the front bedroom
We live on one floor in a new development and it has two bedrooms. The front bedroom is not getting much AC because the duct running in the crawlspace has a vent, in line. When I have the AC on I can ...
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Outside Installation of Window AC
Can I set a window unit completely OUTSIDE and vent ONLY the cold air into my sailboat via vent hose, similar to that used to vent hot air out from a portable AC located inside? The fan would suck ...
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Daikin Mini Split Runs Constantly V2
While googling my issue I came across the following post which describes the exact behavior I am observing as well.
Daikin Mini Split Runs Constantly
I have three indoor units.
Two of them are ...
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Is a sealed/unvented or vented crawlspace better?
I have read articles that a sealed crawlspace is usually drier than an insulated vented crawlspace. I have a vented crawlspace that is vented but is dry. Problem is some of the insulation is falling. ...
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Is a rapidly turning on and off water sensor in A/C pan bad wiring or a bad sensor?
I have an AG-1250E water sensor in the pan of my upstairs AC. It was installed 10 years ago, but recently saved me an overflow. I have an issue though, that when this product trips, it starts turning ...
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Water Leaking Into HVAC Duct
So I’m not sure if this is the best place to share this but I want to at least talk to someone about this and get their opinions.
I purchased a condo about 2 years ago in Northwest Indiana. It’s a ...
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Optimal Bath Fan Location
Trying to decide on placement of bathroom exhaust fan. Primary purpose/concern is moisture from shower. Bathroom is 7'x10' and I've purchased a 110CFM Panasonic Whisper. It says it's rated for "...
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sampling low-voltage HVAC signals with digital hardware
I'd like to monitor my heat pump HVAC system digitally, probably with an Arduino. The goal is to produce simple graphs of all the thermostat signals, so I can monitor how long it's running, first- ...
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AC Condenser making loud noise on start up
Brand new Carrier AC Condenser.
It makes very loud noise on start, check the video link
Ignore the noise you hear for first 4 seconds of video, that is from other AC units on the roof, my unit starts ...
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bypass an HVAC unit float switch (safe-t-switch) [closed]
how to bypass an HVAC unit float switch (safe-t-switch), yes I do understand the importance of the safety switch, I am currently waiting for Amazon to deliver my replacement but in the meantime my ...
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Ac drain pipe leaking
AC drain is in a horrible position - it's leaking on my concrete. will it cause damage?
I live in hot area. Any ideas to fix?
I did a bandage job. AC guy wanted to get a pump from furnace through ...
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How to reduce high pitched noise from condo exhaust vents
I'm renting a 1 bedroom condo in a 4 year old building, which has a central AC/heating HRV system (it's a 4-pipe vertical stack fan coil if that means anything). Picture below.
I've discovered the ...
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What is the blue liquid dripping from outdoor unit of split type air-conditioner, and how to fix?
My mini-split air conditioner is newly installed.
The spec is using R32 refrigerant
Day 1, get installed;
Day 2, notice dripping and called the installation guy again.
Day 5, Install guys change the ...
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Does my AC vent air from the room to outside?
I have an AC unit that has a fan and logic in a unit mounted to the wall, and a box outside that blows air through the condenser(?) Will air from the room be vented outside? If I were brewing beer ...
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how to go about cleaning my AC evaporator coil(indoor) and can i change the size of filter?
so my evaporator coil is gunked up with nasty looking build up and the original filter size is some nonexistant size so what i can buy just lets everything past it. Also the housing seems more to hold ...
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Can a musty smell originate from somewhere other than the AC?
Sometimes when the AC turns off (fan is set to always run), there is a strong musty smell that comes out of the vents for a few hours or so. It comes out of every vent I've checked in rooms and in the ...
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Wire Duct fan to ONLY come on when calling for heat or cooling?
First time posting!
So I've had a duct fan booster going to our master bedroom for years and it's worked pretty good. It always came on with the fan. Just the other day we had a new furnace installed ...
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Fan coil filter access blocked by door frame
I have an indoor hvac that is improperly aligned with the access doorway by 2 inches; as a result I can't install an air filter the intended way. Can I have someone cut a 2 inch wide channel with a ...
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Should an HVAC technician be expected to examine the coil when called to troubleshoot a condensate drain?
12 month old HVAC pan was full, with slow drip. Installer found drain clogged,cleared it and emptied the pan.
The following day the ceiling collapsed. Installer returned and found a lot of debris at ...
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Safe to install foil faced insulation over insulated HVAC line?
I have an exterior overhang on the side of my home with exposed/empty voids.
These voids are the spaces between floor joists in a crawl space.
I'm trying to seal off these voids to keep the drafty air ...
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Best Mini Split BTU Size for Hot Miami Garage: 12'W x 28'D x 12'H
EDIT FOR CONFUSION: The condensor unit will be outside near my front entrance.
I'm a photographer with 12'W x 28'D x 12'H Garage as my studio. It gets very hot, so I've decided to get a Mini Split ...
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Seeking Advice on Timing for Home Energy Audit and AC/Furnace Installation
I have an upcoming AC/furnace installation scheduled, as well as an appointment for a home energy audit. Currently, I’m relying on my HVAC technician to provide the best parts and service. However, ...
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Upstairs AC runs constantly. Air smells moist
My 2-story home, 5000 sq ft, was built in 2000. The upstairs AC constantly runs and the humidity is around 65%. AC is 6 years old and it gets regular maintenance every quarter.
The return vent is in ...
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flex duct vs rigid:noise
My HVAC contractor installed my new furnace and ducting with flexible ducts. The cold air return vents are super loud and I'm wondering if I replaced the flex with rigid, would the system be quieter. ...
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Minimum distances between plumbing, electrical wiring and/or HVAC elements within a waffle slab?
we are trying to route electrical, plumbing (hot/cold/black/sprinklers), and HVAC ducts in a waffle slab ceiling, and was wondering if there's any code requirement that dictates how far those elements ...
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Heat pump not cooling, hard start kit initially fixed for a year, but now problem is back
Its a 3 ton goodman brand new installed in 2022. In 2023 it stopped cooling just blew warm air. Reset breakers, it works again. But then after a day blowing only warm air again. Then followed a ...
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Condensation in ceiling when attic door is open
I opened up my attic today to run some cabling for security cameras and I noticed significant condensation on the ceiling. When I closed the attic door it went away.
Should I be concerned? What is ...
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Basement ventilation for small amount of Radon and some fresh air
We have had a couple tests over the years for radon and I feel like adding a bit of fresh air will only help the low levels we have. We have pretty good humidity control with a heat pump water heater ...
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What to cover this HVAC vent with?
We have an HVAC vent directly under the sink on floor level. It has just been sitting open since we moved in. It’s about 14’to 14.5 in width. What is the best item to cover this with?
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C-Wire Identification in a 40 year old furnace
Our HVAC system is a 1 stage heating and 1 stage cooling. The furnace is GE Ambassador II Model BLU080F942B1 manufactued in 1981. Our system was wired with only R G W and Y. I was trying to install ...
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Is it safe and effective to run two window air conditioners in the same opening?
Solved - I will take yours and other's advice about improving insulation. I'll use the unit I have now until the cooler months around October and over the winter add better insulation in the attic ...
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New vent covers too shallow to cover duct protrusion?
Just replaced all the baseboards in my house and attempting to replace the vent covers. My vents and returns have this metal lip that sticks out resulting in my new vent covers being too thin. Any ...
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Will unplugging power to outside AC unit cause a fuse to blow in the fiurnace?
I accidentally cause the power plugs on AC unit outside to come unplugged.
I called out a Pro and he plugged back in.
He confirmed power is going from basement furnace to Nest thermostat, but no power ...
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My heat pump will not start
My tsat is sending 24v to control board but not reaching contactor.Both pressure switches read closed.Any suggestions?
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Would this subfloor condensation damage require extensive repair?
We had a home inspected and they noticed that the sub-floor is web near the duct registers where they lack proper insulation. I am curious if adding insulation and drying the wood be enough to repair ...
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Problem with my AC
I got complete replacement of HVAC and water heater 2 months ago.
Everything worked for couple of weeks and one day I heard grinding noise when AC started, noise faded away in 20-30 seconds so I ...
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Midea U Shaped Window Unit
This may be too far outside the box but.......With some modifications, might the evaporator of a Midea U shaped window unit be tilted forward 90 degrees, to fit into a top hatch on a sailboat, or an ...
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Advice on duct run route for bathroom extractor?
I'm planning a bathroom refurb soon which will involve replacing and rerouting my ventilation system.
The L-Shaped wall will be knocked down and the wall on door-side will be rebuilt.
Bathroom will be ...
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Are there window fans that seal up when not in use?
Looking for a window fan that can blow in cool air at night and seal up reasonably well during the day when it's hot and I use the AC. Any advice? Yes I've searched the internet but I've gotten ...
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PTAC not cooling room: Can I measure output CFM + temperature to rule out AC issues (e.g. refrigerant, compressor) and focus on finding air leaks?
Super recently replaced my wall PTAC after my complaints, but the new one is still unable to cool the room to specified temperature. I've set it to 60 F but it stays at 70 or so indefinitely. Outside ...
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Why is this pipe dripping water from the outside wall?
My home outer wall pipe is dripping small quantities of water now and then. Upon checking with the builder on my home which was built 3 years ago, he responded that it's a secondary drain pipe and he ...
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Dryer vent on roof
Does anyone know what type of vent this is? My dryer exhaust exits out of the roof through this vent and I am wondering if it may be filled with lint. Unfortunately, I am not able to access the roof.
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Mini split instead of central AC to save money
just purchased a 3/3 1450sf two story townhouse. We work from home in the upstairs office. We run our central AC to cool the office and the bedroom at night, but realize it’s a waste to cool the ...
